Chain post loose leaf binder



March 2, 1937. .1. c. DAWSON 2,072,547

- CHAIN POST LOOSE LEAF BINDER Filed Jan. 31, 1955 Patented Mar. 2, 1937 UNETED STATES PATENT OFFICE CHAIN POST LOOSE LEAF BINDER Application January 31, 1935, Serial No. 4,225

1 Claim.

The invention relates to that type of binder for loose sheets which comprises a pair of binder bars and chain posts housed within and extensible from one of the bars and attached to the other.

The object of the invention is to simplify the means for lengthening the posts to increase the capacity of the binder and to apply to a post of smaller diameter an extension of greater diameter.

The invention is hereinafter described and is illustrated in the accompanying drawing, in which Fig. 1 is a detail view in perspective of a chain post binder embodying the invention;

Fig. 2 is a detail, longitudinal section, partly in elevation, of the improved post;

Fig. 3 is a view in perspective of an enlarging sleeve forming a part of the invention; and

Fig. 4 is a detail View in perspective of the end 20 of a chain post.

The chain post of binders of the type to which this invention relates are usually made in two sizes having diameters, respectively of 1%" and The link at the outer end of each post is 25 socketed and threaded to receive an attaching cap, the stem of which passes through the upper binder bar.

The sheets prepared for use with such binders are provided with holes of corresponding diame- 30 ters, slits leading from the holes to the sheet margin to permit the application of the sheet to the post without removing the upper bar.

In the use of such binders, it is frequently found desirable to use sheets with the larger punching 35 in binders adapted for and in use with sheets of the smaller punching, and in order to adapt the binder to such use, supplemental parts are provided for enlarging the outer end of the posts, such parts consisting of an end link having a tapering body, which is to replace the end link of the smaller diameter, and an attaching cap having an elongatedstem of the larger diameter.

The substitution of these new parts for the original end link of the post is not a simple operation and is quite a handicap to the user of the binder. The present improvement simplifies this operation and renders it quite feasible to adapt the binder for the use of sheets having holes differing in size.

In the drawing, the lower or chain carrying binder bar is shown at l and the upper bar at i i. The posts l2, l2 are formed of links of the smaller diameter, and the elongated attaching caps or" greater diameter than the links of which the chain is formed are shown at l3, 13.

A portion of the chain post of the smaller diameter is shown in Fig. 4, its end link 14 being somewhat longer than the remaining links and having a screw threaded socket IS in its upper end. A sleeve i6 is provided for increasing the diameter of the end link I l to that of an extension stem H, the lower end of the stem it being of reduced diameter and threaded to enter the socket is of the link M. The sleeve l6 tapers at its lower end, as shown at l8 to substantially the diameter of the link M. It is of such size that it may be forced upon the link It with the application of comparatively light pressure, and will be held in place frictionally.

The extension stem I! may be of any desired length and is provided with a threaded socket at its upper end to receive the securing cap Id.

The binder having been filled to normal capacity by sheets having punchings of smaller diameter may be enlarged by the application to the end links [4 of the posts [2 of the sleeves It and. extension stems I'l. Sheets of larger punching may be readily applied to the upper ends of the chain posts and slid upwardly onto the extension stems. The tapering portion I 8 of each sleeve it facilitates this movement.

The application of the enlarging stem to the post does not involve the use of tools and neither does it require the services of a skilled artisan.

What I claim is:--

In a loose leaf binder, in combination with a pair of binder bars, posts uniting the bars, each post comprising a portion formed of pivotally united links, an end link of each having a threaded axial socket, an extension stem of greater diameter than the links and being in threaded engagement with the end link, a tapering sleeve fitting upon the end link, one end thereof being of the diameter of the link and its opposite end being of the diameter of the stem, and means for securing the stem to one of the binder bars.

JAMES C. DAWSON. 

